Question 1

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonding involves the transfer of electrons from a metal to a nonmetal, resulting in electrostatic attraction, while covalent bonding involves the sharing of electrons between two nonmetals.

Question 2

According to the octet rule, atoms tend to gain, lose, or share electrons until they are surrounded by how many valence electrons?

Accepted Answer

$$8$$

Question 3

Which of the following compounds is expected to have the highest lattice energy?

Accepted Answer

CaO

Question 4

Which statement about lattice energy is correct?

Accepted Answer

Lattice energy is the energy required to completely separate one mole of a solid ionic compound into its gaseous ions.

Question 5

Which of the following best explains why NaCl has a higher melting point than KCl?

Accepted Answer

NaCl has a smaller cation, which increases the lattice energy due to stronger electrostatic attraction.

Question 6

Which of the following elements is most likely to form a covalent bond with chlorine?

Accepted Answer

Carbon

Question 7

Which of the following is the correct Lewis symbol for nitrogen?

Accepted Answer

$$\cdot \cdot \cdot N \cdot \cdot \cdot$$

Question 8

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally between two atoms, resulting in partial charges.

Question 9

Which of the following molecules contains a triple bond?

Accepted Answer

$$N_2$$

Question 10

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures are used when a single Lewis structure cannot accurately represent the electron distribution in a molecule.

Question 11

Which of the following ions or molecules is an example of an exception to the octet rule due to having fewer than eight electrons around the central atom?

Accepted Answer

$$BF_3$$

Question 12

Which of the following best explains why electronegativity increases across a period in the periodic table?

Accepted Answer

Atomic radius decreases, so the nucleus is closer to the bonding electrons and attracts them more strongly.

Question 13

Which of the following best describes the dipole moment ($$\mu) of a $$molecule?

Accepted Answer

It is a measure of the separation of equal and opposite charges in a molecule.

Question 14

Which of the following molecules is most likely to be hypervalent (have more than eight electrons around the central atom)?

Accepted Answer

$$PF_5$$

Question 15

A student is asked to draw the Lewis structure for $$NO_2. $$Which of the following is true about this molecule?

Accepted Answer

It has an odd number of electrons and cannot satisfy the octet rule for all atoms.

Question 16

Which of the following best explains why metallic bonds allow metals to conduct electricity?

Accepted Answer

Metals have delocalized electrons that can move freely throughout the lattice.

Question 17

Which of the following best describes the trend in atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases due to increasing nuclear charge pulling electrons closer.

Question 18

Which of the following best describes the relationship between lattice energy and the properties of ionic compounds?

Accepted Answer

Higher lattice energy leads to higher melting points and harder solids.

Question 19

Which of the following is the correct application of Coulomb's law to lattice energy?

Accepted Answer

$$E = k \frac{q_1$ q_2$}{r}$$, where $$E is $$the lattice energy, $$q_1$$ and $$q_2$$ are the charges of the ions, and $$r is $$the distance between them.

Basic Concepts of Chemical Bonding: Chapter 8 Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard